Unit for drying gypsum plaster board

Details Unit for drying gypsum plaster board Unit for drying gypsum plaster board

F - Mech Eng,Light,Heat,Weapons

26

B

F26B 15/12 (2006.01) F26B 3/28 (2006.01)

Patent

CA 2470205

Modern drying units for gypsum plaster board have a feed device, comprising several roller feed units (1) arranged in levels one above the other. The drying section is generally divided into several zones (3 to 7), in particular three longitudinally ventilated zones (4 to 6), being two high temperature zones (4, 5) and a subsequent low temperature zone (6). Due to the high production capacity of the upline production plant and the necessarily long residence time, drying units are very long. According to the invention, black boards (19) are arranged above and below the individual roller feed units (1) in the high temperature zones (4, 5), which extend across the width of the roller feed units (1). The boards (19) are heated exclusively by means of the flowing drying air to an elevated temperature, and transmit additional heat to the through-flowing gypsum plaster board (16) by radiation. It is possible to reduce the length of the drying unit due to the increased heat transfer coefficient.

Les installations modernes de séchage de placoplâtres sont dotées d'un dispositif de transport constitué de plusieurs convoyeurs à rouleaux (1) superposés. La ligne de séchage est en règle générale divisée en plusieurs zones (3 à 7), dont notamment trois zones (4 à 6) à ventilation longitudinale avec deux zones haute température (4, 5) et une zone basse température (6) aboutante. Ces installations de séchage sont très longues à cause du haut rendement de l'installation de production située en amont et du délai d'exécution nécessaire. Selon l'invention, les zones haute température (4, 5) comportent au-dessus et en-dessous de chaque convoyeur à rouleaux (1) des plaques noires (19), qui s'étendent sur la largeur de ces convoyeurs à rouleaux (1). Ces plaques noires (19), qui sont portées à une température élevée par le seul passage de l'air de séchage, irradient de la chaleur supplémentaire sur les placoplâtres (16) passant sur la ligne. Le coefficient de transfert de chaleur élevé permet ainsi de construire des installations de séchage plus courtes .

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